These earmuffs can be worn over the head, behind the head or under thechin, letting you choose the position that is most comfortable. These earmuffs feature a patented Air Flow Control™ technology that delivers maximum noise reduction. The comfortable, inner ventilated headband reduces pressure on the head and is more breathable in warm environments. These earmuffs can easily be worn with other PPE including hard hats, faceshields, respirators and welding shields. Dielectric construction is safe for use around electrical hazards. Meets ANSI S3.19-1974. Imported. Specify NRR from the drop-down menu above.